garrett



No. 750,635. I PATENTED JAN 26, 1904.

G. GARRETT.

FURNACE.

APPLICATION FILED FEB. 26, 1903.

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. Y PATENTED JAN. 26, 1904.

G. GARRETT.

FURNACE.

APPLIGATION FILED FEB. 26, 1903.

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THE NORRIS PETERS co. Pno'ru-umo WASHINGTON, n. c.,

7 PATENTED JAN. 26, 1904. G. GARRETT.

FURNACE.

APPLICATION FILED FEB. 26, 1903.

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No. 750,635. PATENTED JAN. 26, 1904. G. GARRETT.

FURNACE.

APPLICATION FILED FEB. 26, 1903.

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UNITED STATES Patented January 26, 1904..

GEORGE GARRETT, OF COATBRIDGE, SCOTLAND.

FURNACE.

SPECIFICATION forming part of Letters Patent N 0. 7 50,635, dated January 26, 1904. Application filed February 26, 1903. Serial No. 145,143. (No model.)

To all whom it may concern} Be it known that I, GEORGE GARRETT, asubject of the King of the United Kingdom of Great Britain and Ireland, residing at Laird street, Coatbridge, Lanarkshire, Scotland, have invented certain new and useful Improvements in Furnaces, (for which application for patent has been made in Great Britain, No. 28,613, dated the 27th of December, 1902,) of which the following is a specification.

This invention relates to heating-furnaces, such as reverberatory furnaces, having a producer or combustion chamber whose base or bottom is formed by a water-pan and in which the combustion of coal or other fuel takes place on the injection of air through a perforated grate over the pan. The grate is usually formed of a number of grate-bars which interfere with the free descent of the ash and clinker resulting from the combustion of the fuel. I obviate that objection according to my invention by dispensing with the ordinary grate-bars and making the grate in the form of a tubular casing to approximate to the rectangular or other contour in plan of the combustion-chamber and locate it under the front and side walls and the bridge of said chamber, so as to support or constitute the base of said walls. This casing is of approximately rectangular cross-section under the front and side walls; but the rear portion under the bridge is preferably of rhomboidal section or has its inner face inclined. The inner sides are each perforated, the perforations being at varying angles, so that the airblast which is led from a fan or blower through an air-inlet connected to the tubular casing is thence directed upward through the perforations into the fuel within the combustionchamber. There is thus no obstruction offered to interfere with the free descent of the ash and clinker which drops into a water-pan placed under the combustion-chamber and furnished with a seal-board.

The invention is illustrated by the accompanying drawings, in which Figure l is a longitudinal vertical section of part of a reheating-furnace to which my improved iiring-grate or air-box is shown applied. Fig. 2 is a horizontal section thereof,

grate-bars to support the fuel is formed bya hollow casing or air-box C, upon which the brickwork walls of the furnace rest, and under said air-box and extending forward of it is located a water-pan D, wherein the ash from the fuel consumed in the furnace collects. The air-casing C approximates in plan to the rectangular contour of the fuel-chamber, which is built over it, and while it is of approximately rectangular cross-section under the front and side walls A its rear portion under the bridge A is of rhomboidal section, as particularly indicated at Fig. 7, and has its inner face 0 inclined. The sides of the air-box facing inward to the fuel-chamber are perforated, the perforations 0 being at varying angles. but in general inclining upward. so that the air-blast may be directed upward through them into the fuel within the chamber A. Air for this purpose is led into the air-casing C from a fan or blower by an air inlet-pipe C connected to a flanged opening C at one side of the casing C.

ater-boxes E are fitted in the side walls of the furnace A over the air-casing C and are connected by circulating water-pipes to prevent or lessen the formation of clinker on the side walls.

Firing-doorways F, furnished with hinged doors F, are provided in one of the side walls of the furnace, and in the opposite side wall clinker-doorways G are formed and fitted with doors G, while a cleaning door-opening H and door H and additional clinker-doorways are formed in the front wall A. These smaller doorways permit of the insertion of suitable tools for breaking off clinker which may adhere to' the walls A.

The water-pan D is furnished with a sealwith perforations on its inner face and being furnished with a pipe connection to an airblower and water-boxes located over the airboX in the side walls of the furnace.

In witness whereof I have hereunto set my hand in presence of two witnesses.

GEORGE GARRETT.

l/Vitnesses:

VVALLACE CRANs'roN FAIRWEATHER, JOHN MORTON. 

